Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A touch display device comprising: a display panel in which a plurality of pixels defined by a plurality of data lines and a plurality of gate lines are arranged, a pixel electrode is arranged for each pixel area, and a transistor, an ON/OFF state of which is controlled by a gate signal supplied through a gate line and which is electrically connected between a data line and the pixel electrode, is arranged for each pixel area; and a touch-sensing circuit configured to supply a driving signal to the data line during a first section, in which the gate line is driven to be turned on, to receive a first signal through the data line, to receive a second signal through the data line during a second section, in which the gate line is driven to be turned off, and to acquire touch information based on the first signal and the second signal, wherein the first section and the second section are included in a time of touch driving, and wherein the first signal corresponds to a sum of a capacitance associated with the pixel electrode and a parasitic capacitance associated with the data line, and the second signal corresponds to the parasitic capacitance associated with the data line.
A touch display device integrates a display panel with a touch-sensing circuit to detect touch inputs without requiring additional touch-sensing layers. The display panel includes a grid of pixels, each defined by intersecting data lines and gate lines. Each pixel area contains a pixel electrode and a transistor that controls electrical connection between the data line and pixel electrode based on gate signals. The touch-sensing circuit operates in two phases during touch driving. In the first phase, the gate line is activated, allowing the circuit to supply a driving signal to the data line and receive a first signal representing the combined capacitance of the pixel electrode and the parasitic capacitance of the data line. In the second phase, the gate line is deactivated, and the circuit receives a second signal representing only the parasitic capacitance of the data line. By comparing the first and second signals, the circuit derives touch information, such as touch location or pressure, by isolating the pixel electrode's capacitance contribution. This approach eliminates the need for separate touch-sensing hardware, reducing device complexity and cost while maintaining display functionality. The method leverages existing display components to perform touch sensing, optimizing efficiency and integration.
2. The touch display device of claim 1 , wherein: the capacitance associated with the pixel electrode includes at least one of a capacitance between the pixel electrode and a touch object and a capacitance between the pixel electrode and a common electrode, and the parasitic capacitance associated with the data line is a capacitance between the data line and the touch object.
A touch display device integrates touch sensing functionality with a display panel, addressing the challenge of accurately detecting touch inputs while minimizing interference from display operations. The device includes an array of pixel electrodes, each forming a capacitance with a touch object (e.g., a finger) or a common electrode. This capacitance is used to detect touch events. Additionally, the device includes data lines that transmit display signals to the pixel electrodes, and these data lines exhibit parasitic capacitance with the touch object, which can introduce noise into touch sensing. The device is designed to distinguish between the desired touch-related capacitance (from the pixel electrode) and the parasitic capacitance (from the data line) to improve touch accuracy. By separating these capacitances, the device reduces errors caused by display-related interference, ensuring reliable touch detection even during active display operation. The solution enhances the performance of touch-sensitive displays by mitigating the impact of parasitic capacitances on touch sensing accuracy.
3. The touch display device of claim 1 , wherein the touch-sensing circuit includes: a touch-driving circuit including an amplifier for supplying the driving signal to the data line, a sensing capacitor for storing the first signal or the second signal, an integrator for integrating the first signal or the second signal stored in the sensing capacitor to output an integral value, and an analog-to-digital converter (ADC) for converting the integral value into a digital value, and a touch processor configured to acquire the touch information based on the digital value.
A touch display device incorporates a touch-sensing circuit designed to detect touch inputs with improved accuracy and efficiency. The circuit includes a touch-driving circuit that supplies a driving signal to a data line, which interacts with a touch panel to generate a first signal when no touch is detected and a second signal when a touch is detected. The touch-driving circuit features an amplifier to drive the signal, a sensing capacitor to store either the first or second signal, and an integrator that integrates the stored signal to produce an integral value. This value is then converted into a digital format by an analog-to-digital converter (ADC). A touch processor analyzes the digital output to determine touch information, such as touch location or pressure. The system enhances touch detection by processing the integrated signal, reducing noise and improving signal clarity. This design is particularly useful in display devices where precise and reliable touch sensing is required, such as smartphones, tablets, and interactive displays. The touch-sensing circuit's components work together to ensure accurate touch data acquisition, addressing challenges like signal distortion and environmental interference.
4. The touch display device of claim 1 , wherein the second signal has a signal polarity opposite that of the first signal.
Technical Summary: This invention relates to touch display devices, specifically addressing the challenge of improving touch sensing accuracy and reducing interference in capacitive touchscreens. The device includes a display panel with a plurality of touch sensing electrodes arranged in a matrix. During operation, the device generates a first signal with a specific polarity to drive the display panel and a second signal with an opposite polarity to drive the touch sensing electrodes. The opposing polarities of the first and second signals help cancel out electrical noise and interference, enhancing touch detection sensitivity and accuracy. The touch sensing electrodes are configured to detect changes in capacitance caused by user touch input, and the device processes these changes to determine touch location and gestures. The use of opposing signal polarities minimizes crosstalk between the display driving signals and the touch sensing signals, improving overall performance in environments with high electromagnetic interference. This design is particularly useful in high-resolution displays where touch sensing accuracy is critical.
5. The touch display device of claim 1 , wherein the touch-sensing circuit uses the first section and the second section as one set section to perform the set section two or more times, and accumulates the first signal and the second signal to acquire the touch information.
A touch display device includes a touch-sensing circuit configured to detect touch inputs on a display screen. The device addresses the challenge of accurately sensing touch inputs while minimizing interference from display driving signals. The touch-sensing circuit operates by dividing the display screen into multiple sections, including at least a first section and a second section. The circuit uses these sections as a single set section, repeating this set section two or more times during touch sensing. During each repetition, the circuit captures a first signal from the first section and a second signal from the second section. These signals are then accumulated to derive touch information, such as touch location or pressure. By combining multiple measurements, the device improves touch detection accuracy and reduces noise from display operations. The approach allows for real-time touch tracking without disrupting display functionality, making it suitable for smartphones, tablets, and other interactive displays. The invention enhances touch sensitivity and reliability in environments where display and touch-sensing circuits share the same panel.
6. The touch display device of claim 1 , wherein the driving signal applied to the pixel electrode is a pulse signal, and a common voltage applied to a common electrode varies in correspondence with the driving signal.
A touch display device includes a display panel with pixel electrodes and a common electrode. The device detects touch input by measuring changes in capacitance between the pixel electrodes and a touch object, such as a finger. The driving signal applied to the pixel electrodes is a pulse signal, and the common voltage applied to the common electrode varies in correspondence with this driving signal. This synchronization between the driving signal and the common voltage improves touch sensitivity and reduces interference, allowing for accurate touch detection while maintaining display functionality. The device may include a touch detection circuit that processes the measured capacitance changes to determine touch coordinates. The display panel may be an active-matrix organic light-emitting diode (AMOLED) or liquid crystal display (LCD) panel, where the pixel electrodes are part of the display's pixel structure. The common electrode may be a transparent conductive layer, such as indium tin oxide (ITO), shared between the display and touch sensing functions. The pulse signal and varying common voltage ensure that touch sensing does not disrupt the display's operation, providing a seamless user experience. This design is particularly useful in modern touchscreens where high touch sensitivity and display performance are required.
7. The touch display device of claim 1 , further comprising: a photosensor electrically connected between a source node and a drain node of the transistor and configured to conduct a leakage current in response to radiation of light thereon.
A touch display device includes a photosensor electrically connected between a source node and a drain node of a transistor. The photosensor is configured to conduct a leakage current when exposed to light radiation. The device also includes a display panel with a plurality of pixels, each pixel having a light-emitting element and a driving transistor. The driving transistor controls the current supplied to the light-emitting element based on a data signal. The photosensor is integrated into the display panel and operates in conjunction with the driving transistor to detect light exposure. When light strikes the photosensor, it generates a leakage current that affects the transistor's operation, allowing the device to sense ambient light conditions or touch inputs. This integration enables the display to function as both a display and a touch-sensitive interface without requiring additional external sensors. The photosensor's placement and electrical connection to the transistor ensure efficient light detection while maintaining the display's performance. The device is particularly useful in applications where compact design and integrated functionality are desired, such as smartphones, tablets, and wearable displays.
8. The touch display device of claim 7 , further comprising: a light source configured to output the light; and a light guide member configured to guide the light source from the light source to be radiated on the photosensor.
A touch display device includes a display panel with a touch sensing layer and a photosensor positioned adjacent to the display panel. The photosensor detects light emitted from an external light source, such as a finger or stylus, when the display panel is touched. The device further includes a light source and a light guide member. The light source generates light, which the light guide member directs toward the photosensor. This configuration allows the photosensor to detect the presence of an external light source, enabling touch input detection. The touch sensing layer may include a plurality of photosensors arranged in an array to detect touch positions across the display. The light guide member ensures efficient light transmission from the light source to the photosensor, improving detection accuracy. This system enhances touch sensitivity and responsiveness by leveraging light-based detection in addition to traditional touch sensing methods. The device is particularly useful in applications requiring precise and reliable touch input, such as smartphones, tablets, and interactive displays.
9. The touch display device of claim 8 , wherein: the light guide member is located in a different layer from the transistor and is arranged over an entire area or a part of the display panel, and the light source is located in an outer area of the touch display device.
This invention relates to a touch display device with an integrated light guide member for enhancing display functionality. The device addresses the challenge of providing uniform and efficient backlighting while maintaining touch sensitivity and display performance. The light guide member is positioned in a separate layer from the transistor layer, allowing it to be placed over the entire display panel or a specific portion of it. This configuration ensures even light distribution across the display area. The light source is positioned in an outer area of the device, outside the active display region, to avoid interference with touch sensing and display components. The light guide member redirects light from the external source to illuminate the display uniformly, improving visibility and reducing power consumption. The device may also include a touch sensor layer for detecting user input, ensuring seamless integration of touch functionality with the lighting system. This design optimizes space utilization and enhances the overall performance of the touch display device.
10. The touch display device of claim 7 , wherein the photosensor is turned on in a section in which the transistor is turned off.
A touch display device includes a photosensor and a transistor, where the photosensor is activated in a region where the transistor is deactivated. The device operates in a display mode and a touch sensing mode. In the display mode, the transistor is turned on to drive a display element, such as an organic light-emitting diode (OLED), while the photosensor remains inactive. In the touch sensing mode, the transistor is turned off, and the photosensor is activated to detect light variations caused by a touch input. The photosensor converts the detected light into an electrical signal, which is processed to determine the touch position. The device may include a plurality of pixels, each containing a transistor and a photosensor, arranged in an array. The photosensor may be integrated into the pixel structure or positioned adjacent to it. The transistor controls the display element's operation, while the photosensor enables touch detection without requiring additional external components. This design allows for a compact and efficient touch display system that combines display and touch sensing functions in a single device. The photosensor's activation in the transistor's off-state ensures that touch sensing does not interfere with display operations, improving overall performance.
11. The touch display device of claim 1 , wherein the touch-sensing circuit acquires touch presence/absence information or touch position information corresponding to the touch information.
A touch display device includes a touch-sensing circuit that detects touch interactions on a display surface. The touch-sensing circuit is configured to acquire touch presence/absence information, indicating whether a touch is detected, and touch position information, specifying the location of the touch on the display. The device may also include a display panel for visual output and a touch sensor layer integrated with or overlaid on the display panel. The touch-sensing circuit processes signals from the touch sensor layer to determine touch characteristics, such as whether a touch is present and its precise coordinates. This allows the device to respond to user input by enabling touch-based interactions, such as selecting displayed elements or navigating interfaces. The system may further include a controller to interpret the touch information and execute corresponding actions, such as adjusting displayed content or triggering software functions. The touch-sensing circuit may use capacitive, resistive, or other sensing technologies to detect touch events. The device is designed for applications in smartphones, tablets, or other interactive displays where accurate and responsive touch detection is essential.
12. The touch display device of claim 1 , wherein the touch-sensing circuit acquires fingerprint information corresponding to the touch information.
A touch display device includes a touch-sensing circuit that detects touch information, such as the position and pressure of a touch input. The device also includes a display panel for presenting visual content and a control circuit that processes the touch information to determine user interactions. The touch-sensing circuit is further configured to acquire fingerprint information corresponding to the touch information, enabling biometric authentication or identification. The fingerprint information may be extracted from the same touch input used for position and pressure sensing, allowing for seamless integration of touch and fingerprint recognition. This dual-functionality enhances security and user convenience by eliminating the need for separate fingerprint sensors. The device may be used in smartphones, tablets, or other electronic devices where touch input and biometric authentication are required. The touch-sensing circuit may employ capacitive, resistive, or other sensing technologies to capture both touch and fingerprint data. The control circuit processes the acquired data to distinguish between touch gestures and fingerprint patterns, ensuring accurate input recognition. This integration reduces hardware complexity and cost while improving the overall user experience.
13. The touch display device of claim 12 , wherein the touch-sensing circuit acquires the fingerprint information from the entire area of the display panel when acquiring the fingerprint information corresponding to the touch information.
A touch display device includes a display panel and a touch-sensing circuit. The display panel has a touch-sensitive surface for detecting touch inputs. The touch-sensing circuit is configured to acquire touch information from the touch-sensitive surface and to simultaneously capture fingerprint information from the entire area of the display panel when acquiring the fingerprint information corresponding to the touch information. The touch-sensing circuit processes the touch information to determine touch location and gesture data, while also extracting fingerprint data from the same touch interaction. The device may include additional components such as a controller to process the acquired data and a memory to store the fingerprint information. The touch-sensing circuit may use capacitive or optical sensing techniques to detect both touch and fingerprint data. The device ensures that fingerprint authentication can be performed seamlessly during normal touch interactions, improving user convenience and security. The system may also include calibration mechanisms to enhance the accuracy of fingerprint acquisition across the entire display area. The touch display device is particularly useful in mobile devices, tablets, and other portable electronics where space efficiency and multifunctionality are critical.
14. A touch-sensing method of a touch display device including a display panel in which a plurality of pixels defined by a plurality of data lines and a plurality of gate lines is arranged, a pixel electrode is arranged for each pixel area, and a transistor, an ON/OFF state of which is controlled by a gate signal supplied through a gate line and which is electrically connected between a data line and the pixel electrode, is arranged for each pixel area, the touch-sensing method comprising: receiving a first signal through the data line after a driving signal is supplied to the data line during a first section, in which the gate line is driven to be turned off; receiving a second signal through the data line during a second section, in which the gate line is driven to be turned on; and acquiring touch information based on the first signal and the second signal, wherein the first section and the second section are included in a time of touch driving, and wherein the first signal corresponds to a sum of a capacitance associated with the pixel electrode and a parasitic capacitance associated with the data line, and the second signal corresponds to the parasitic capacitance associated with the data line.
This invention relates to touch-sensing methods for display devices, specifically addressing the challenge of accurately detecting touch inputs while minimizing interference from parasitic capacitances in the display panel. The method is designed for a touch display device with a display panel containing pixels defined by intersecting data lines and gate lines. Each pixel includes a pixel electrode and a transistor that controls the connection between the data line and the pixel electrode based on a gate signal. The method involves two distinct phases during touch driving. In the first phase, a driving signal is applied to the data line while the gate line is turned off, allowing the measurement of a first signal through the data line. This first signal represents the combined capacitance of the pixel electrode and the parasitic capacitance of the data line. In the second phase, the gate line is turned on, and a second signal is measured through the data line, which corresponds solely to the parasitic capacitance of the data line. By comparing the first and second signals, the method isolates the capacitance associated with the pixel electrode, enabling accurate touch detection. This approach improves touch-sensing accuracy by distinguishing between touch-induced capacitance changes and parasitic effects, enhancing the reliability of touch input detection in display devices.
15. A touch-sensing circuit of a touch display device including a display panel in which a plurality of pixels, defined by a plurality of data lines and a plurality of gate lines, is arranged, a pixel electrode is arranged for each pixel area, and a transistor, an ON/OFF state of which is controlled by a gate signal supplied through a gate line and which is electrically connected between a data line and the pixel electrode, is arranged for each pixel area, the touch-sensing circuit comprising: a touch-driving circuit configured to receive a first signal through the data line after a driving signal is supplied to the data line during a first section, in which the gate line is driven to be turned on, and to receive a second signal through the data line during a second section, in which the gate line is driven to be turned off; and a touch processor configured to acquire touch information based on the first signal and the second signal, wherein the first section and the second section are included in a time of touch driving, and wherein the first signal corresponds to a sum of a capacitance associated with the pixel electrode and a parasitic capacitance associated with the data line, and the second signal corresponds to the parasitic capacitance associated with the data line.
A touch-sensing circuit for a touch display device integrates touch sensing with a display panel containing pixels defined by data lines and gate lines. Each pixel includes a pixel electrode and a transistor controlled by a gate signal from a gate line, connecting the data line to the pixel electrode. The touch-sensing circuit includes a touch-driving circuit and a touch processor. The touch-driving circuit receives a first signal through the data line after a driving signal is applied during a first section when the gate line is active, and a second signal during a second section when the gate line is inactive. The touch processor uses these signals to derive touch information. The first signal represents the combined capacitance of the pixel electrode and the parasitic capacitance of the data line, while the second signal represents only the parasitic capacitance of the data line. This design allows the circuit to distinguish between touch-induced changes in pixel electrode capacitance and background noise, improving touch accuracy. The first and second sections occur within the same touch-driving period, enabling efficient touch detection without disrupting display operation.
16. The touch-sensing circuit of claim 15 , wherein the touch-driving circuit includes: an amplifier for supplying the driving signal to the data line; a sensing capacitor for storing the first signal or the second signal; an integrator for integrating the first signal or the second signal stored in the sensing capacitor to output an integral value; and an analog-to-digital converter (ADC) for converting the integral value into a digital value, and wherein the touch processor acquires the touch information based on the digital value.
A touch-sensing circuit is designed to detect touch inputs by analyzing signals from a data line connected to a touch panel. The circuit includes a touch-driving circuit that generates and processes signals to determine touch information. The touch-driving circuit comprises an amplifier that supplies a driving signal to the data line, a sensing capacitor that stores either a first signal (representing a touch event) or a second signal (representing no touch), and an integrator that integrates the stored signal to produce an integral value. An analog-to-digital converter (ADC) then converts this integral value into a digital value, which is processed by a touch processor to derive touch information. The circuit improves touch detection accuracy by amplifying, storing, integrating, and digitizing the sensed signals before processing. This design enhances sensitivity and reduces noise interference in touch-sensing applications, such as touchscreens or touch-sensitive surfaces. The system ensures reliable touch detection by converting analog signals into digital data for precise analysis.
17. The touch-sensing circuit of claim 15 , wherein the second signal has a signal polarity opposite that of the first signal.
A touch-sensing circuit is designed to detect touch inputs on a touch-sensitive surface by analyzing electrical signals. The circuit generates a first signal with a specific polarity and a second signal with an opposite polarity. The first signal is applied to a first set of electrodes, while the second signal is applied to a second set of electrodes. The circuit measures the resulting signals to determine the presence and location of a touch event. The opposite polarity of the second signal helps cancel out noise and improve signal accuracy. The circuit may also include a processing unit to analyze the measured signals and output touch data. This design enhances touch detection reliability by reducing interference and improving sensitivity. The circuit can be integrated into various touch-sensitive devices, such as touchscreens or touchpads, to provide accurate and responsive touch input detection. The use of opposing polarity signals allows for better differentiation between actual touch events and background noise, leading to more precise touch sensing.
18. A display panel comprising: a plurality of data lines; a plurality of gate lines; a pixel electrode arranged for respective pixel areas of each a plurality of pixels defined by the plurality of data lines and the plurality of gate lines; and a transistor, an ON/OFF state of which is controlled by a gate signal supplied through a gate line and which is electrically connected between the data line and the pixel electrode and is arranged for each pixel area, wherein: a data line is electrically connected to a touch-sensing circuit, during a first section, the gate line is driven to be turned on, the data line applies a driving signal to the pixel electrode, and a first signal stored in the pixel electrode is transmitted to the touch-sensing circuit, and during a second section, after the first section, the gate line is driven to be turned off and the data line transmits a second signal, different from the first signal, to the touch-sensing circuit, wherein the first section and the second section are included in a time of touch driving.
This invention relates to a display panel with integrated touch-sensing functionality, addressing the challenge of combining display and touch detection in a single device without requiring additional layers or complex structures. The display panel includes data lines, gate lines, pixel electrodes, and transistors for each pixel area. The transistors control the flow of signals between the data lines and pixel electrodes based on gate signals. During touch detection, the panel operates in two phases: a first section where the gate line is activated, allowing a driving signal to be applied to the pixel electrode and a first signal to be transmitted to a touch-sensing circuit, and a second section where the gate line is deactivated, and a second, distinct signal is sent to the touch-sensing circuit. Both phases occur within a single touch-driving period, enabling efficient touch detection without disrupting display operation. The design simplifies the integration of touch functionality by leveraging existing display components, reducing manufacturing complexity and cost. The touch-sensing circuit processes the first and second signals to determine touch input, enhancing responsiveness and accuracy. This approach eliminates the need for separate touch-sensing layers, making the display panel thinner and more cost-effective.
19. The display panel of claim 18 , further comprising: a photosensor electrically connected between a source node and a drain node of the transistor and configured to conduct a leakage current in response to radiation of light thereon.
A display panel includes a transistor and a photosensor. The photosensor is electrically connected between the source and drain nodes of the transistor. The photosensor is configured to conduct a leakage current when exposed to light radiation. This design allows the display panel to detect light exposure, which can be used for various applications such as ambient light sensing, touch detection, or image capture. The transistor provides switching or amplification functionality, while the photosensor generates a measurable current in response to light, enabling the panel to respond dynamically to environmental conditions. The integration of the photosensor with the transistor ensures efficient signal processing and reduces the need for additional external components, simplifying the overall structure of the display panel. This technology is particularly useful in devices requiring light-sensitive features, such as smartphones, tablets, or digital cameras, where accurate light detection enhances user experience and functionality.
20. A driving circuit of a touch display device including a display panel in which a plurality of pixels defined by a plurality of data lines and a plurality of gate lines is arranged, a pixel electrode is arranged for each pixel area, and a transistor, an ON/OFF state of which is controlled by a gate signal supplied through a gate line and which is electrically connected between a data line and the pixel electrode, is arranged for each pixel area, the driving circuit comprising: a data-driving circuit configured to output an image data voltage to the data line; a touch-driving circuit configured to output a driving signal for touch sensing to the data line; and a selection circuit electrically connecting one of the data-driving circuit and the touch-driving circuit to the data line, wherein: when the touch-driving circuit is connected to the data line by the selection circuit, the touch-driving circuit receives a first signal through the data line after the driving signal is supplied to the data line during a first section, in which the gate line is driven to be turned on, and receives a second signal through the data line during a second section, in which the gate line is driven to be turned off, wherein the first section and the second section are included in a time of touch driving, and wherein the first signal corresponds to a sum of a capacitance associated with the pixel electrode and a parasitic capacitance associated with the data line, and the second signal corresponds to the parasitic capacitance associated with the data line.
This invention relates to a driving circuit for a touch display device that integrates both display and touch sensing functions. The device includes a display panel with pixels defined by intersecting data lines and gate lines, each pixel having a pixel electrode and a transistor controlled by a gate signal. The driving circuit comprises a data-driving circuit that outputs image data voltages to the data lines, a touch-driving circuit that outputs touch sensing signals to the data lines, and a selection circuit that switches between connecting the data-driving circuit or the touch-driving circuit to the data lines. During touch sensing, the selection circuit connects the touch-driving circuit to the data lines. The touch-driving circuit first supplies a driving signal to the data lines during a first section when the gate lines are turned on, allowing the pixel transistors to conduct. The touch-driving circuit then receives a first signal through the data lines, which reflects the combined capacitance of the pixel electrode and the parasitic capacitance of the data lines. In a second section, when the gate lines are turned off, the touch-driving circuit receives a second signal that corresponds only to the parasitic capacitance of the data lines. By comparing these signals, the circuit isolates the capacitance associated with the pixel electrode, enabling accurate touch sensing without interference from parasitic effects. This approach improves touch sensitivity and display performance by efficiently separating touch and display functions in time.
Unknown
November 26, 2019
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